Acanthosis nigricans or otherwise known as skin pigmentation matures on exposure to sun and are reasons for dark skin patches around the neck. It is very embarrassing for many people of having dark skin patches around their neck, dark knees and elbows. Bigger number of folds is around the elbows and knees and it is generally thicker. There are no oil organs in these territories, so this part of skin has a tendency to be more dried. Of course, if you do not take care about these parts of skin, skin on knees and elbows are much darker than other part of skin. Underarms may be dark because of using bad quality of antiperspirants or shaving. Awareness about your dark underarms, make you embarrassing to raise hands. That makes it necessary to be very careful before using any kind of cosmetic, even if they smell so good. Many remedies can resolve these problems, so this article will present you the best.